Microwave radiation bursts and the suprathermal electron velocity distribution in impulsive phase solar flares

Details Microwave radiation bursts and the suprathermal electron velocity distribution in impulsive phase solar flares Microwave radiation bursts and the suprathermal electron velocity distribution in impulsive phase solar flares

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306..323d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 306, July 1, 1986, p. 323-326.

Physics

Plasma Physics

Electron Energy, Hot Electrons, Microwaves, Solar Flares, Solar Radio Bursts, Velocity Distribution, Plasma Physics, Tokamak Devices

Scientific paper

The observations of microwave bursts from impulsive phase solar flares is discussed in terms of a simple emission mechanism based on a triple resonance instability. This mechanism relies on the distinctive feature of the parallel electron velocity distribution which has been theoretically predicted to occur in the emitting region: a bump in the high-energy tail. The characteristic velocity required for the bump and the polarization and frequency predicted for the radiation appear to be consistent with the observations and with existing theoretical work. The demands placed on this emission mechanism complement those given by results from tokamak discharges during current decay. It is suggested that this emission mechanism may represent a step toward understanding both sets of results, and supports the theoretical predictions of bump-in-tail suprathermal electron velocity distributions in both cases.

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